maric,cssc - ASEF - Asian Shipbuilding Experts

5 th ASEF in Busan, 1-2 Dec. 2011What effect would IACS HarmonizedCSR have from the viewpoint of theshipbuilding industry?Wu JiamengChina Association of the National Shipbuilding Industry(CANSI)

Background of CSR-H• Basic Principles For CSR Harmonization• Current Status of CSR-H• CANSI’s suggestion in Tripartite 20112011-12-01 MARIC,CSSC 3

Basic Principles For CSR Harmonization• Main principles:‣ Harmonization will be based on a consistent methodology at theadoption of the original CSR‣ In compliance with the IMO GBS where GBS FunctionalRequirement fall within the scope of the CSR-H‣ The level of the harmonized Rule criteria will be equivalent to orhigher than the current CSR criteria2011-12-01 MARIC,CSSC 4

Views on Principles (1)Based on the Principles, it could be found that:• If rule requirement could be harmonized, the moreconservative item will normally be chosen in CSR-H unlessit can be proved to be too conservative. In that case, thelevel of structural safety for CSR-H is not less than CSR-OT or CSR-BC. At the same time, such rule requirement inCSR-H should in compliance with IMO GBS.‣ Rule Min. thickness‣ ……2011-12-01 MARIC,CSSC 5

Views on Principles (2)• If rule requirement in corresponding CSR-OT and CSR-BC could not be harmonized, new requirement based ona consistent methodology and approach will be redeveloped.At the same time, such new rule requirementin CSR-H should in compliance with IMO GBS.‣ CSR-H loads‣ CSR-H Screening fatigue Assessment‣ ……2011-12-01 MARIC,CSSC 6

Views on Principles (3)• For some requirements not been covered by CSR-OTand CSR-BC but in compliance with IMO GBS, newrequirement should be developed and added in CSR-H.‣ Residual strength‣ Structural Redundancy‣ Vibration impact on fatigue‣ ……2011-12-01 MARIC,CSSC 7

Harmonised CSR Time Schedule2011201220132014EAG ReviewPeriod1 st draftExternalExternal ReviewTCReviewPeriodSubmission toIMO for GBSverificationEffectiveDateCSR-HAdoptionNOWDeterminedunchangeable2011-12-01 MARIC,CSSC 8

Current Status of CSR-H (1)• Information From IACS in the Tripartite 2011:‣ The CSR Harmonization Project has completed aninternal draft text of the harmonized rules.‣ Software is being developed in parallel to the ruledevelopment, therefore the Consequence Assessment(CA) based on the latest draft version has not beencompleted yet so further CA is still required.2011-12-01 MARIC,CSSC 9

Current Status of CSR-H (2)• But, from EAG-4 meeting, it was found that:‣ Some rule contents are not finalized‣ Some need additional investigation and studies‣ Only preliminary results from consequenceassessment‣ Less instant supporting software or technicalbackgrounds2011-12-01 MARIC,CSSC 10

CANSI’s suggestion in Tripartite 2011• 1st draft CSR-H should be released at a right time whenthe industry can get more complete and qualified Rule text,sufficient results of consequence assessment reviewed byEAG and more transparent technical background.• Supporting software is to be released as soon as possibly,if the whole package cannot be supplied in time,spreadsheets may also be helpful.• IACS should give more time for industry for better externalreview.2011-12-01 MARIC,CSSC 11

Effect expectation of CSR-H• Adequate coverage for CSR-H?• CSR-H software in the future• Estimated impact on newly build tankers andBulk carriers2011-12-01 MARIC,CSSC 12

Adequate coverage for CSR-H? (1)• GBS functional requirement:‣ Human element and ergonomic considerations including access,noise and vibration‣ Vibration consideration to prevent damage of structure,equipment or machinery• Other parts of the existing class rules:‣ ice class requirement‣ tug pushing area reinforcement‣ rudder horn requirement2011-12-01 MARIC,CSSC 13

Adequate coverage for CSR-H? (2)• Experience or studies from industry‣ Simplified fatigue analysis for upper deck region details, e.g.deck opening, outfitting brackets or pads, ……Source:TSCF 20102011-12-01 MARIC,CSSC 14

Views on the FE analysis (1)• Is it necessary to do the FE analysis for the foremostcargo hold?‣ Local scantling determined by large local pressure‣ Bottom structures determined by slamming‣ Shell structures determined by bow impact‣ Deck structures determined by green sea load‣ Review by consequence assessment2011-12-01 MARIC,CSSC 15

Views on the FE analysis (2)• For aftermost cargo hold, differentdesign concept determine thedifferent arrangement.‣ It’s difficult to unify the standardloading conditions.‣ Besides the standard loadingconditions, it is suggested to providethe guideline on how to choose thecritical loading condition.2011-12-01 MARIC,CSSC 16

CSR-H software in the future• More Friendly Interface:‣ Exchange of calculation models• Ease of use:‣ Reduce time spent on verification‣ Fast modeling on fore/aft cargo region and foremost/aft mostcargo hold‣ Fast fine mesh modeling with 50X50 or very fine mesh modelingwith tXt or 10X102011-12-01 MARIC,CSSC 17

CSR-H Impact expectation (1)• May enhance the level of structural safety‣ Based on Harmonization PrinciplesScantlings will be used as a proxy for level of structuralsafety. Therefore, CSR-H may increase steel weight.2011-12-01 MARIC,CSSC 18

CSR-H Impact expectation (2)• Promote the development of optimized design‣ Steel weight increase will influence EEDI‣ Optimized design: Lines and loading condition Structural Arrangement, incl. cargo division, hopper knuckle,spacing, …… Scantling optimization, especially in Fore/Aft cargo hold, using FEmethod required by CSR-H Detail optimization, especially for anti-fatigue Higher tensile steel of HT32 or HT36 used more Workmanship, e.g. post welding2011-12-01 MARIC,CSSC 19

CSR-H Impact expectation (3)• Increase design threshold and design costs‣ Due to lots of optimization‣ Due to better understanding of complicated CSR-H rule textand technical background‣ Due to lots of direct analysis, not only for mid cargo area, butfor Fore/Aft cargo area and Foremost/Aft most cargo hold‣ Design period may be double at least due to FE analysis2011-12-01 MARIC,CSSC 20

• For CSR-H Schedule:Conclusions‣ 1st external draft CSR-H be released at a right time‣ Supporting software be released as soon as possibly‣ More time for industry for better external• For CSR-H coverage:‣ GBS functional requirements‣ Common requirements of existing Rules‣ Experience or studies from industry• For CSR-H effect expectation:‣ May enhance the level of structural safety‣ Promote the development of optimized design‣ Increase design threshold and design costs2011-12-01 MARIC,CSSC 21

Conclusions• We hope the Asian shipbuilders would promote moreinternational cooperation to get the better understandingand use with harmonized Rules.• Asian shipbuilders would give more contribution toexternal review for better CSR-H.2011-12-01 MARIC,CSSC 22

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